1.Solar Water Heater Rubber Parts 2.Diameter: 20mm 3.RoHS;ISO9001certification 4.100%material 5.Nontoxic, antioxidative Products feature1,made of 100% silicone material 2,nontoxic, odorless, non-corrosive ,antioxidative3,Each product have good quality and a long service life.Product attributesNamesilica gel circleFull specifications20,25,32,47,58,70mmProduct size20mmFlanging Height12mmPackage ...